Ballot #1: The Signature

The Franken campaign challenged this ballot, arguing the voter left an identifying mark on the ballot. (MPR has blacked-out the signature to respect the voter's privacy.) Minnesota law states: "If a ballot is marked by distinguishing characteristics in a manner making it evident that the voter intended to identify the ballot, the entire ballot is defective." (MPR Photo/Laura Yuen)

Ballot #1: The Bachmen

The Franken campaign challenged this ballot in Ramsey County where the voter appears to have written "Bachmen" — presumably a reference to U.S. Rep. Michele Bachmann — in the write-in field. (Caroline Yang for MPR)

Ballot #2: The Pencil

The Coleman campaign questioned this Ramsey County ballot because while the oval for the Presidency was filled in with pen, the rest were filled in with pencil, calling into question whether the ballot had been properly duplicated. (Caroline Yang for MPR)

Ballot #3: The X Factor

The Franken campaign challenged this ballot in Ramsey County, arguing the voter drew an "X" in over the oval for Norm Coleman, signifying the voter's intent to cross-out the vote for Coleman. (Caroline Yang for MPR)

Ballot #2: The Thumbprint

The Franken campaign challenged this Anoka County ballot, arguing that the thumb print on it constitutes a distinguishing mark. If a voter signs a ballot or writes his Social Security Number on it, that ballot is invalid under Minnesota state law. The State Canvassing Board will need to determine whether this thumbprint has the same effect. (MPR Photo/Curtis Gilbert)

Ballot #3: Outside the lines

Ballot #4: The NO ballot

This ballot was challenged in Dakota County because two ovals were filled in. Minnesota law says a ballot is valid is election officials can determine the voter's intent. (Image courtesy of Dakota County)

Ballot #5: Lizard People

This Beltrami County voter cast their ballot for Al Franken, but also put "Lizard People" as a write-in candidate, not only in the U.S. Senate race, but for several others. The county auditor/treasurer ruled that the vote should not be counted because it's considered an overvote. Representatives for Franken challenged that decision. (MPR Photo/Tom Robertson)

Ballot #6: The Checkmark

This Olmsted County voter placed a checkmark next to Al Franken's name and also circled one of the guide marks for the optical scanner. The Coleman campaign challenged the voter's intent. (MPR Photo/Sea Stachura)

Ballot #9: The Eraser

The Franken campaign challenged this ballot. Even though the voter filled in the bubble next to Barkley's name, a Franken representative said what appear to be eraser marks over Franken's bubble indicated the voter intended to vote for Franken. (MPR Photo/Curtis Gilbert)

Ballot #10: The Confusion

The Coleman campaign kept this ballot from going into the 'Other' pile. They argued that while the voter filled in the bubble next to Dean Barkley, the voter had intended to vote for Coleman because of the small dot inside Coleman's bubble. (MPR Photo/Curtis Gilbert)

Ballot #11: The Underline

The Franken campaign challenged this ballot, arguing the voter intended to vote for Franken. "He was underlining Al," said Franken volunteer Jeff Lange, who made the challenge. (MPR Photo/Curtis Gilbert)